Organized-gambling venues such as those at Las Vegas tend to attract:

A) risk-loving individuals only.
B) even risk-averse people because they are designed to allow individuals to win.
C) people who may be irrational in their choice of gambling and are often risk-averse.
D) only professional gamblers.

Organized gambling venues such as Las Vegas tend to attract people who may be irrational in their choice of gambling and are often risk-averse. While some individuals may be risk-loving, the design of these venues is actually to ensure that the house always wins, rather than allowing individuals to win. Therefore, option B is incorrect. It is also unlikely that only professional gamblers would be attracted to such venues, making option D an incorrect choice as well.